Rotary pump



:5 She ets-Sheet A. E PAIGE ROTARY PUMP Filed March 12, 1925 Feb. 26, 1929. f 1,103,204

A. E. PAIGE ROTARY PUIP Filed larch 12, 1926 3 Sheets-Sheet 2 FIG. II

Patented Feb. 25, 3929.

ARTHUR E. PAIGE, F PHILADELPHIA, PENNSYLVANIA.

nomaY PUMP.

Application filed March 12, 1926. Serial No. 94,174.

My invention relates to pumps of the type including a pair of gears which are intermeshed and rotated in a casing, so as to carry a liquid in the toothed spaces of said gears from an inlet to an outletin said casing, and is particularly designed and adapted for use in the art of forming what are known as artificial silk threads by the extrusion of a colloid, such as the thiocarbonate of cellulose known as viscose, through a spinneret orilice, into a coagulating medium such as an aqueous solution containing sulphuric or hydrochloric acid.

The form of my invention hereinafter described is adapted to supply such a colloid, under pressure, through a conduit leading to a single spinneret. to be driven by driving gearing which may be common to an extensive series of similar pumps, and includes adjustable means for selectively rendering it operative and inoperative, at the will of the operator, so that each pump may be separately controlled without interference with the others. Such individaxially shift the driven gear on the pump out of mesh with the driving gear by which it. is normally rotated, and withoutinterrupting the rotation of said driving gear, so that a series of such pumps may be operatively con nected with the same train of driving gearing and may be individually selectively rendered operative and inoperative without in terference with each other and without interrupting the continued operation of the driving gearing.

The quantity of liquid to be delivered to the spinneret is extremely small and, consequently, the slightest fluctuation in the volume or rate of such delivery would be manifest in irregularities in the filament extruded, from the spinneret. Therefore, it is an object and effect of my invention to provide construction and arrangement capable of extreme accuracy of construction, to insure its regularity of performance. lVIoreover, in pumps of the construction ordinarily employed for the purpose abovecontemplated, the means for rendering the pump operative or inoperative the pump conduits or passageways for the liquid; requiring adjustment of the conduit connections both to initiate and terminate the operation of the pump; with the consequence that slight wear upon the movable That pump isvarranged' ual pump controlling means is arranged to with respect to its driving gear,have involved joints causes leaks therein through which air sucked into the stream'of colloid being delivered through the pump, and is occluded as bubbles therein which, of course, are forced into the filament extruded through the spinneret and cause the extruded filament to break at, the portions thereof thus aerated, when subjected to tensile strains which the normal filament is entirely capable of withstanding. Therefore, an advantageous feature of my invention is that the possibility of such infiltration of air is avoided by so constructing and arranging the passageways for the liquid through the pump that they are not disturbed by any adjustment or manipulation to control the operation of the pump by engagement and disengagement of its actuating mechanism.

My invention includes the various novel features of construction and arrangement hereinafter more definitely specified.

In said drawings; Fig. I is a plan View of a pump conveniently embodying my invention. Fi II is a vertical sectional View of said pump, taken on the line II, II in Fig. I. Fig. III is an inner face view of the pump mechanism-as removed from its base. Fig. IV is a fragmentary sectional view, showing a modified form of adjustable driving gear. Fig. V is a plan view of a pump including a. modified form of my invention, in connection with a viscose supply conduit. 7 Fig. VI is an end elevation of the structure shown in Fig. V, with said conduit indicated in section. Fig. VII is an elevation of the opposite end of said structure shown in Figs. V and VI. Fig. VIII is a longitudinal sectional view of said structure, taken on the line VIII, VIII in Fig. V. I

In Figures I toIV inclusive; the pump base is conveniently formed as a single iron or steel casting of L-shaped cross section, in.- cluding'the horizontal flange 1 with openings 2 for screw attaching means, and the vertical flange 3 having screw threaded pipe sockets 4t and 5 therein for respective permanent connoction with the inlet pipe 7 and outlet pipe 8. Said vertical base flange 3 has two screw threaded holes 10' extending therethrough at the upper portion thereof and two similar screw threaded holes 1 1 extending therein at the lower portion thereof, and has its face 12 machined and ground plane to accurately fit the hardened steel pump. chamber plate 13 which has its opposite. faces. ground in pressure of said spring 61 and crmveniently by a cone pointed push rod 66, such as a lead pencil, which may be conveniently thrust in the axial opening 67 in said hub web 63, as indicated in dotted lines in Fig. IV. Such axial movement may be effected while the gear wheel 62 is rotating; but said wheel may be held in disengaged position by clamping its set screw 55 against said shaft 4:7, in the keyway 5 1 in said shaft.

As the operation of pumping viscose tends to wear the metal from the walls of the pump chamber at the opposite plane faces of said p mp gears 23 and 21, causing leaks and loss of efficiency, 1 find it desirable to interpose face plates of hardened steel between said pump chamber plate 13 and the adjacent faces of the base and frame plate, as hereinafter described.

Although in the have respectively designated the pipes 7 an 9 as inletand outlet pipes; it may be observed that the construction and arrangement of the pump are so symmetrical that the pump gears may be rotated in either direct-ion and, consequently, either of said pipes may be the inlet and the other the outlet. Such construction and arrangement are advantageous in that they facilitate the washing out of the pump connections by operating the pump alternately in opposite directions.

However, said inlet pipe may be omitted and the pump base directly connected with a viscose supply conduit having a series of sup-' ply ports; so that said conduit serves to support a series of similar pumpsrespectively local to the supply ports therein, as shown in Figs. V to VIII inclusive.

In rigs. V to VIII inclusiveptl e pump base 71 has the conduit channel 72 between laterally extending bolt flanges 73 and the plane faced flange 75 extending transversely to said bolt flanges 73 in lieu of the flange 3 above described. Said base 71 has the inlet port 7 6 extending from said conduit channel 7 2 to the plane face of said flange 7 5. and the outlet port 77 extending from said plane face of said flange 7 5, in spaced relation with said inlet port 76 and leading through a conduit '78 to the spinneret 79. Said base has the gasket seat 80 surrounding said inlet port 76 in said conduit channel 72 and has a series of screw threaded bolt heles 81 in its flange '75.

The clamp plate 83 has the conduit channel 61 between laterally extending bolt flanges 85 and complementary to the channel 72 and flanges 73 in said base 71. T 1e bolts 86 are provided with nuts 87 and arranged to connect said flanges 73 and 85 and clamp the con duit 88 in rigid relation with said base 71, to supply the v scose or other liquid to be pumped. The resilientgasket 89, conveniently gasket seat 80 and arranged to register with the supply port 90 in said conduit 88 and to foregoing description, I

' is rigidly formed of soft rubber, is fitted in said seal'the junction of said supply port 90 with said inlet port 7 6 when said base and clamp plate areclamped together as'shown.

The pump chamber plate 91 has the series of bolt holes 92 adapted to register with'the bolt holes 81 in said base two pets 91 and 95 respectively adapted to register with said inlet port 76 and outlet port 77, and has the pump chamber 96 between said ports. The face plates 98 and 99 are fitted upon respectively opposite sides of said pump chamber plate 91 and have respective series of bolt holes 100 and 101 adapted to interchangeably register with the bolt holes 81 in said base. As shown in the d rawings, said plates 98 and 99 are alike and symmetrical, so that they may be reversed or replaced to compensate for wear upon the inner faces thereof by the gears in the pump chamber formed between them. The frame plate 102 has the series of bolt holes 103 adapted to register with the holes in said chamber plate, face plates andbase, and has two shaft bearings 101 and 105 registering with. said chamber, said bearing 10 1 being of less axial extent than the thickness of said frame plate; the other of said bearings, 105, extending through said frame plate 102 and having the stuffing box 107'and gland 108 in coaxial relation therewith. The through shaft 110 extends in said through bearing 105 and stuffing box and gland and carriesthe key 111 at the inner end thereof, extending in said chamber 96 and limiting the outer movement of said shaft 110. The pump gear 113 has the seat 11 1 for said key 111 and is detachably connected with said keyed shaft 110 within said chamber 96. The other pump gear, 115,

extends in said chamber 96, in mesh with said first pump gear 113 and has the shortstud shaft 116 rigidly connected therewith, ex-' tending in said short shaft bearing 10 1 in said frame plate 102.

connected to the outer end of said keyed shaft 110, by the set screw 1'19 and may be driven by an intermediate gear 120 connecting it with the driving gear 121 as indicatedin Fig. VII. Said intermediate gear 120is journaled on the stud shaft 123 which is rigidly connected. with the bearing plate 124. Said plate/12 1 is fitted to turn upon said stuffing box 107 and has the slot 125 in registry with one of the tap bolts 126. Said plate .121 may be rigidly clamped against said plate 102, in (imposition shown in Fig. VIII, in which said pump gearing is operatively connected, or, by 126, said plate124 may be turned to disengage said intermediatc'gear 120 from the driving gear 121 and thus render the pump idle without interference with any other pump in the'series. There are four ofsaid tap bolts extending through said frame plate, face plates, and pump chamber plate, into engagement with said screw threaded holes flange 75, and has- The driving gear 118 loosening said bolt in said base,

81. in saidybasoflange 75, to hold. said plates in assembled rigid relation with said base; whereby all of themovable parts of said pump may be removed from said base, by removing saidit'ap bolts 126, without disturbing said base or the pipe lines 78 and 87, connector therewith.

I do not desire-to limit myself to t cise details of construction and arrang mcnt herein set: forth as it is obvious that various modificat'ons may be made therein without departing from. the essential, features of my invention as defined in-the appended claims.

I: claim:

1; In a rotary pump, the combination with a base having means wherebyit may be maintained in. stationary position or d including a vertical flange provided with an inlet pipe socket and; an outlet pipe socket upon one side thereot and: having a plane face upon the opposite side thereof and a series of rew three-red bolt holes; of 2, pump chamber plate havinga series of bolt holes adapted torcgister with the bolt holes two ports adapted to register, with said inlet and outlet, and a pump chamber between said ports; aframe plate having a series of: bolt holes adaptedto register W? In the holes in said chambe pla e and base and having); two shatt beari registering with said chamber, one or? saidbearingsbeing 0t less Xial extent" than the thickness of said frame plae, but havme; a screw threaded opening throughsaid frame plate in coax..- relation therewith; means arranged to .7, ,1 said screw threaded opening, including a screw plug and. a gasket; theoth-er of said bearings extending through saidtrame plate and having a stuilingbox and gland in coaxial relationtherewith; shaft extending; insaidthrough bearing and Shilling box and gland, having a key way at the outer end thereof and carrying a key, at the inn 1' end thereof, extending in said chamber, limiting the outer movement of said shaft; gear detachably connected with said shaft within said chamber; another gear in said chamber, in mesh first pump gear and having ash 7 connected therewith, e: iodine; in

shaft journal in-sz idfrai e pla o- 21 great fitted to the outer end shaft, in axially adjust-rib with, and c; ri'yi an adjuur i in the kryway of said sha to ad ustably pre mesh with 1 a (illi the operator, l idingthe edge of said-driving; extendingthrough said 0 and chamber plate ant not on said bolt arranpg' o adjusted position, and a spring, encircling SllOl bolt; between said nut and roller, ar-

mos-aesrangcd tonormally maintain said roller 1, inst the head of said bolt; whereby the ai-iial position of the head of said bolt determines whet-her said driving gearis in operative or inoperative position; and other bolts extending through the registered openings in said frame plate and chamber platein en- ,o; ement with said base; whereby said pump may be rendered operative or inoperative by axial movement of its driving gear, and all of the movable portions ot-said pump may be removed from said base, without dis turbing paid base or the pipe lines connected therewith,

2.; In. a rotary pump, the combination with a base having means whereby it may be maintained in stationary position,- and ineluding an inlet pipe socketand an, outlet pipe socket upon one side thereof anda plane ,aec upon the oppositeside thereof and a s ofbolt holes; of a pumpehamber plate a series ot bolt holes adapted to I e with the bolt holes in said base, two ports adapted tore ter with said inlet and outlet, and a pump chamber between said ports; a frame plate having a series of bolt holes adapted to register with the holes in said chamber plate and: base and having two shaft bearings registoring with said. chamher, one of said-bearings havinganopening through said. frame plate and removable means arranged to seal that oiening; the other of said bearings extending through said frame plate and? having a stalling box and gland in coaxial relation; therewith;- a extending iii said through bearing and sl stufiing be and. gl nd, having a keyway at the outer end thereof'and carrying a key, at the inner end thereof, extending in said chamber; a pump connected with said gear ed shaft within said chamber; another 7 up pear, in said chamber, in mesh with said pump gear and having a shift connected. therewith, extending in said other shalt bearing}; in said frame plate; adriving gear titted to the outer end of said keyed shaft, in, axially adjustable relation therewith; means arranged to adjustably present said dri gear in mesh with driving train and to detain said gear disengaged i on, at the will of the operator, ine udi roller embracing the edge otsaid driv ear, a screw bolt (J-liter d through said frame plate, and r her plate and said l)? u said bolt arposit-ion,

*, bet reen ,3, on irolin nl roller, arr-ant id ro ler againsta llpesition of- 'the head eormmes whether: said driv- 'n-operat-iye or inoperative posiand otherv bolts extendingthrough the registered openings in said frame plate and chamber plate, in engagement, with; said portions of said pump may be removed from said base, without disturbing said. base or the pipe lines connected therewith.

3. In a rotary pump, the combination with.

a base having means whereby it may be maintained in stationaryposition andincluding an inlet pipe socket and an outlet pipe socket upon one side thereof and a plane faceupon the opposite side thereof and a series of bolt holes; of a pump chamber plate having a series of bolt holes adapted to register with the bolt holes in said base, two ports adapted to register with said inlet and outlet, and a pump chamber between said ports; a frame plate having a series of bolt holes adapted to registerwith the holes in said'chamber plate and base and having two shaft bearings registering with said chamber, one of said bearings having means arranged to hermetically close its outer end; the other of said bearings extending through said frame plate and having a stufiing box and gland in coaxial relation therewith; a driving shaft extending in said through bearing and stufiing box and gland, and extending in said chamber; a pump gear detachably connected with said driving shaft within said chamber; another pump gear, in said cham her, in mesh with said first pump gear and having a shaft connected therewith, extending in said other shaft bearing in said frame plate; a driving gear fitted to the outer end of said keyed shaft, in axially adjustable relation therewith; means arranged to adjustably present said. driving gear in mesh with a driving train and to detain said gear in disengaged position, at the will of the operator, including a spring, arranged to normally maintain said gear in operative posi-* tion, and a screw arranged to detain it in inoperative position; and other bolts oxtend ing through the registered openings in said frame plate and chamber plate in engagement with said base; whereby said pump may be rendered operative or inoperative by axial movement of its driving gear, and all of the movable portions of said pump may be re moved from said base, without disturbing said base or the pipe lines connected therewith.

i. In a rotary pump, the combination with a base having means whereby it may be maintained in stationary position and including an inlet pipe socket and an outlet pipe socket upon one side thereof; of a pump chamber plate having two ports adapted to register with said inlet and outlet, and a pump chamber between said ports; a frame plate having two shaft bearings registering with said chamber; two shafts jo'urnaled in said bearings; two pump gears respectively connected with said shafts and meshed within said chamber; a driving gear fitted to the outer end of'onc ofsaid shafts, in axially adjustable relation therewith; and means adjustable to presentsaid driving gear in mesh with a driving train'and to detain said gear in disengaged position, at the will of the operator;

*hereby said pump tive or inoperative by axial movement of its driving gear, and all of the movable portions of said pump may be removed fromsaid base,

without disturbing said base or the pipe lines connected therewith.

5. In a rotary pump, the combination With a base having means whereby it may be maintainedin stationary position and including an inlet pipe socket and an outlet pipe socket upon one side thereof and having: a plane face upon the opposite side thereof; of a pump chamber plate having two ports adapted to register with said inlet and outlet, and a pump chamber between said ports; a frame late having two shaft bearings registering with said chamber; two shafts journaled in said bearings; two pump gears respectively connected with said-shafts and meshed withinsaid chamber; a driving gearlitted to'the outer end of one of said-shafts; and means adv justable to present said driving gear in mesh with a driving train andto detain said gear in disengaged position, at the will of the operator; whereby said pump may be rendered operative or inoperative and all of the movable portions of said pump may be removed from said base, withoutdisturbing said base or the pipe lines connected therewith.

6. In a rotary pump, the combination with a base having a conduit channel between latorally extending bolt flanges, and a plane faced flange extending transversely to said bolt flanges, having an inlet port extending from said conduit channel to said plane face, and an outlet port extending from said plane face, in spaced relation. with said inlet port, a gasket seat surrounding said inlet port in said conduit channel and a series of screw threaded bolt holes in said plane faced flange; of a clamp plate having a conduit channel between laterally extending bolt flanges and complementary to the channel and flanges in said base; bolts arranged to connect said vith said base; a resilient gasket fitted in said gasket seat, arranged to register-with a sup ply port in said conduit and to'seal the junction of said supply port with said inlet port; a pump chamber plate having a series of bolt holes adapted to register with the boltholes in said base flange,,tw'o ports adapted to register with said inlet and outlet, and a pump chamber between said ports; face plates fitted upon respectively opposite sides of said pump chamber plate, having a series of bolt holes adapted to register with the bolt holes in said base; a frame plate having a series ofbolt holes adapted to register wit-h the holes in said chamberplate, face plates and base'and may be rendered opera- 'hauing two shaft bearings registering with said chamber, one of said bearings being-of less axial extent than "thetlnclzness of said frame plate; the other of said bearings extending through said frameplate and-having a 'stu'llingbo'x and gland in coaxial relation therewitlma shaft extending in saidthrough through said frame plate, face plates and pump chamber plate, into engagement "with said screw threaded holesin saidbaseflange, arranged to hold said plates in assembled rigidrelation with saidbase; whereby all of the'movable portions of saidpump maybe removed from said base, without disturbing said base or the pipe lines connected therewith.

7 In a rotary pump, the combination with a base ihavinga conduit channel and a plane faced flange extending transversely to said channel, having aninlet portextending from said conduit channel to said plane face,-and an outletport extending from said plane face, in spaced relation with said'inlet port,-and a series of'boltholes in said plane faced flange; of a clamp plate having a conduit channel complementary'to the channel in said base; means arranged'to connect saidbase and plate and clamp a conduit in rigid relation with said base; means in said base channel arranged .to register with a supply port in said conduit and to seal the junction of said sup ply port with. said inlet port; a piunip'chamber plate havin a series of bolt holes adapted to register with the bolt holes in said base fiangatwo ports adapted to'register with said inlet an d outlet, and a'pump chamber between said ports; face plates fitted upon respectively opposite sides of said pump chamber plate, havinga series of bolt holes adapted to register with the boltholes'in saidbase; a frame plate having a series of bolt holes adapted to register/with the holes in said chamber plate, face plates and base and having two shaft bearings registering with said chamber, one of said bearings being short and of less axial extent than the thickness of said frame plate; the other of said bearings being long and extending through said frame plate; a through shaft extendingin said through bearing and into said chamber; a pump gear connected With'that shaft within said chamber; another pump gear in said chamber, in mesh with said first pump gear, and having a short shaft rigidly connected therewith, extending outer end of said through shaft ;-bolts extend- V ing'through said frame plate, face plates and pump chamber plate, into engagement with said bolt holes in said base flange, arranged to hold said plates in assembled rigid relation with said base; whereby all of the movable portions ofsaid pump may be removed fron'rsaidb'ase, without disturbing said base or the'pipe lines connectedtherewith.

'8. Ina rotary pumpythe combination 'with a'base'having a conduitchannel and a plane faced flange extending transversely to said channel, lravingan inlet portextending from said conduitchannel to said plane face,'and an outlet "port extending from said plane face, in spaced relation with said inlet port, and a series of bolt'holes iii-said plane faced flange; of a clamp plate having a conduit channel complementary to t-h 'channel'in said base; means arranged to connect said base and plate and clamp a conduit in rigid relation with said base; means in said-base-channel arranged to register withasupply port in said conduitand to seal-the junction of said supply port with said inlet port; a pump chamber plate having a series of bolt holes adapted to register with the bolt'h'oles in said base flange, two ports adapted to rcgisterwith said inlet and outlet, and a pump chamber between said ports; a frame plate having a series-of bolt'holes adapted'to register with 'theholesin said ehamber 'plate and base and having two shaft hen-rings registering with said chamber, one of saidbearings being short and of less axial extent than the thickness of said frameplate theother of said bearings beinglong-and extending through said frame plate; a through shaft extending in said through bearing and into said chamber; another pump gear in said chamber, in mesh with said first pumpgear, and having a. short shaft rigidly connected there ith, extending in said short shaft journal in said frame plate; and driving means connected to the outer end of said through shaft; bolts extendingthrough said 'franie plate and pump chamber plate, into engagement with said bolt holes in said base flange, arranged to hold said plates in assembled rigid relation with said base; whereby all of the movable portions of said pump maybe removed from saidbasan ithout disturbing said base or the pipe lines connected therewith.

9. In a rotary pump,thecombination with a base having eonduit engaging fiangeand a'plane faced-flange with an inlet port to said plane face, and an outlet' port extending from said plane face, in spaced relation with said inlet port, and a'series of bolt holes in said plane facechflange of means=arranged tohold a conduitin communication with said inlet; a pump chamber plate havinga series-of bolt holes adapted to register with the bolt holes in said base flange, two ports adapted to register with said inlet and out-let, and a pump chamber between said ports; face plates fitted upon respectively opposite sides of said pump chamber plate, having bolt holes adapted to register With the bolt holes in said base; a frame plate having bolt holes adapted to register with the holes in said chamber plate. face plates and base. and having two shaft bearings registering with said chamber; a shaft extending in one of said bearings and exterior to said frame plate; a pump gear connected with said shaft within said chamber; another pump gear in said chamber, in aesh with said first pump gear, and having a shaft rigidly connected therewith, extending in said er shaft bearing in said frame plate; a driving gear fitted to the outer end of said first shaft; bolts extending through said frame plate, face plates and pump chamber plate, into said holes in said base flange, arranged to hold said plates in assembled rigid relation with said base; whereby all of the movable portions of said pump may be re moved from said base, without disturbing said base or the pipe lines connected therewith. I i

10. In a rotary pump, the combination with a base having a conduit engaging flange and a plane faced flange with an inlet port to said plane face, and an outlet port extending from said plane face, in spaced relation with said inlet port, and a series of bolt holes in said plane faced flange; of means arranged to hold a conduit in communication with said inlet; a pump chamber plate having a series I of bolt holes adapted to register with the bolt holes in said base flange, two ports adapted to register with said inlet and outlet, anda pump chamber between said ports; a frame plate having bolt holes adapted to register with the holes in said chamber plate, and base and having two shaft bearings registering with said chamber; a shaft extending in one of said bearings and exterior to said frame plate; a pump gear connected with said shaft within said chamber; another pump gear in said chamber, in mesh with said first pump gear, and having a shaft rigidly connected therewith, extending in said other shaft hearing in said frame plate; a driving gear fitted to the outer end of said first shaft; bolts extending through said frame plate and pump chamber plate, into said holes in said base flange, arranged to hold said plates in assembled rigid relation with said base; whereby all of the movable portions of said pump may be removed from said base, without disturbing said base or the pipe lines connected therewith.

11. In a rotary pump, the combination with a base having an inlet port and means ar ranged to connect a liquid supply conduit therewith, and having an outlet port, in spaced relation with said inlet port; of a pair frame plate having of intermeshed gears between said inlet and outlet ports, and in communication therewith shaft for said intermediate gear supported by said intermediate gear plat-e; whereby said intermediate gear may be held in operative pesition by the screw means connecting said frame plate with said base, and all of the movable parts of said pump may be removed from said base, without disturbing said base or the conduits connected therewith.

I 12- In a rotary pump, the combination with a base having an inlet port and an outlet port; of a pair of pump gears intermeshedbetween saidports; shafts for said pump gears; a bearings for said shafts; a driving gear, on one of said shafts; an intermediate in mesh gear; and means supporting said interme diate gear, including a plate fitted to oscillate upon said frame plate; and means detachably securing said frame plate to said base plate; whereby all of the movable portions of said pump and its driving gearing may be removed from said base, without disturbing said base or the conduits connected therewith.

13. In a rotary pump; the combination with a base adapted to fit a cylindrical conduit and having an inlet port adapted to register with a port in said conduit; of damp in means arranged to detachably secure said base up on such a conduit; a pump frame plate carrying pumping means independently of said base; means detachably securing said frame plate to said base; a shaft carried by said. frame plate and arranged to actuate said pumping means; a driving wheel on said shaft and means arran ed to operatively connect and disconnect said driving wheel with respect to a driving mechanism without interruption cf the rotation of said driving mechanism; whereby a series of such pumps may be supported by and in communication with a conduit common to all of them and each pump may be independently connected with and disconnected from a driving mechanism common to all of said pumps, without interruption of the operation of said driving mechanism or of the other pumps.

14. In a rotary pump, the combination with a base having an inlet port; of clamping means arranged to rigidly connect said base with a supply conduit having a port in registry with the port in saidbase; of three plane plates, including opposite face plates and an with said driving ion intermediate 'prunp chamber plate, arranged to formaprunp Chamber; interrneshed gears amounted in sald pump chamber a lrame plate carrying means arranged to actuate said gears, independentlyo fs'aid base; and means de'taehably securing saidplates to said base; Wherebyall of the pump mechanism inaybe removed from said. base WllZllGdl; disturbing the connection of the latter with the supply conduitand said face@latesana-ybe replaeed ltoeonrpensate for 'Wear withoutlossjof other parts.

15. In a rota1'y,pu1np, the eombinatlonwitll -a pair of syn'unetrieal iaee plates; or an ln'lernlediare pump chamber plate ;'and means eonneetingsaid plates to form a pump chaznbm. housing a pair of inlerlneshed pulnp gears; whereby said *faee plates may be reversed lie compensate for wear oi said gears upon the inner faees'o'li' said face 'plares.

16. In a rotary prunp, the combination Will! a pair of lnterrneshed P111111) gearsyo'i a driving "gearoperatively connected with one of said pump gears; and means arranged l'o operatively connect and disconnect said driving gearwith a driving train, Without interrupt-ion of theoperation e f-the latter; including screw means normally nraintaininp; the

' gea in operative driving relation, arranged parts in op to 'be e all shifed i0 verniitconneeliien anddisconnection or saiddrlving gear-train.

1-7. In a'rotarypunrpflhe' eombinafionwith a pair o'f inlierlneshed punlp'gears ;-0'f a driving oper-arively connected with one 016' said pump gears; and means arranged 'to opera'ths'ely connect ancldisconneetsaid drivrng' gear *Wllll-TL driving train, Without interruptiono'l the operation ofthe'latter; includlngr screw means 'norina maintaining the We driving *re on; said SCREW'IHGZERSGXCGflillDQ parallel W hthe axis of said gears and adjusrably'movable to a-niah .l-y'shilt said (lrwlnp;gear re and from 1113 ARTHUR PAEGYE.

this twenlyfiith 'day of February, 

